<div dir="ltr"><br><div>Well, piece of mind for my managers really. As the host is a VM the client could have veam'd it or made a snapshot without us knowing and would be able to restore it elsewhere even after I have wiped the existing VM. I dont have access to the ESX host, I only have SSH access.</div>
<div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Dec 17, 2013 at 10:37 AM, Alain Williams <span dir="ltr"><<a href="mailto:addw@phcomp.co.uk" target="_blank">addw@phcomp.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Tue, Dec 17, 2013 at 09:59:40AM -0000, Martin A. Brooks wrote:<br>
> On Tue, December 17, 2013 09:57, Oliver Howe wrote:<br>
> > Anyone have a better way?<br>
><br>
> dd is likely to be more successful.<br>
<br>
</div>What are you trying to achieve ? Presumably protect stuff from being grabbed by<br>
whoever subsequently has access to the hardware.<br>
<br>
What stuff - customer data or operating system programs that everyone has access<br>
to ?<br>
<br>
How much effort do you think someone will put into to try to recover the<br>
customer data ? If a lot then 'rm' just puts blocks back onto the file system free<br>
list, you might want to use a program like 'shred' to overwrite blocks first.<br>
<br>
Customer data is the most important. This is likely to be under /home or /var or similar.<br>
I would concentrate of clearing that first. Then worry about things like<br>
passwords in /etc/shadow.<br>
<br>
Beware doing 'dd if=/dev/zero of=/dev/hard-disk' The dd program has several<br>
libraries dynamically linked into it, on one *nix a few years ago when I<br>
overwrote a file that was memory mapped (dump doing a restore), the program died<br>
when part of its memory image got replaced by zeros.<br>
<br>
<br>
<br>
Also think about where the backups are done to.<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
Alain Williams<br>
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.<br>
<a href="tel:%2B44%20%280%29%20787%20668%200256" value="+447876680256">+44 (0) 787 668 0256</a> <a href="http://www.phcomp.co.uk/" target="_blank">http://www.phcomp.co.uk/</a><br>
Parliament Hill Computers Ltd. Registration Information: <a href="http://www.phcomp.co.uk/contact.php" target="_blank">http://www.phcomp.co.uk/contact.php</a><br>
#include <std_disclaimer.h><br>
</font></span><div class="HOEnZb"><div class="h5"><br>
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